Sahih Bukhari

Narrated By Salim : 'Abdullah bin 'Umar said, "Allah's Apostle said, "Eat of the meat of sacrifices (of 'Id al Adha) for three days." When 'Abdullah departed from Mina, he used to eat (bread with) oil, lest he should eat of the meat of Hadi (which is regarded as unlawful after the three days of the 'Id).